Updates the maximum number of inbound and outbound HRMP channels per parachain to 150 in each direction.

See [`Pallet::dispatch_whitelisted_call_with_preimage`].

- **Problem Statement:** Increasing the maximum number of inbound and outbound HRMP channels per parachain to 150.
- **Significance:** Enhancing communication capabilities within the Polkadot network.
- **Proposed Solution:** Update the maximum number of HRMP channels to 150 in each direction.
- **Expected Outcomes:** Improved network efficiency and communication capacity.

#896 [Whitelisted Caller] Update Max HRMP Channels

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